短语讲解：

1. They say we should not be concerned about alien beings any time soon.

concern about 使（自己）关心…
例句：She showed great concern about you.
她很为你担心。

2. Professor Garrett has been listening for radio signals from other planets, searching for signs of extraterrestrial life.

search for 搜索，搜寻; 访求
例句：The search for peace also means the search for justice.
寻求和平也意味着寻求正义。

3. The researchers split up the other couples and gave them a mate that the birds had not chosen themselves.

split up <非正>瓜分; 劈成
例句：That party split up into two groups.
这个政党分裂成两个小集团。


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